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* '''Windows6.1-KB947821-v34-x64.msu'''* '''Windows6.1-KB947821-v34-x64.msu''' - Hot fix for Windows (KB947821) updateKB is for Knowledge base with the number of the article it refers to. This tool is a misnomer in that it is nothing more than a fix for bugs in Windows 7 preventing the service pack from correctly installing on some systems.